package com.cong.cojcodesandbox;

import cn.hutool.core.date.StopWatch;
import cn.hutool.core.io.FileUtil;
import cn.hutool.core.io.resource.ResourceUtil;
import cn.hutool.core.util.ArrayUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.dfa.WordTree;
import com.cong.cojcodesandbox.mode.ExecuteCodeRequest;
import com.cong.cojcodesandbox.mode.ExecuteCodeResponse;
import com.cong.cojcodesandbox.mode.ExecuteMessage;
import com.cong.cojcodesandbox.mode.JudgeInfo;
import com.cong.cojcodesandbox.utils.ProcessUtils;
import com.github.dockerjava.api.DockerClient;
import com.github.dockerjava.api.async.ResultCallback;
import com.github.dockerjava.api.command.*;
import com.github.dockerjava.api.model.*;
import com.github.dockerjava.core.DockerClientBuilder;
import com.github.dockerjava.core.command.ExecStartResultCallback;
import com.github.dockerjava.core.command.LogContainerResultCallback;
import org.apache.catalina.Host;
import org.springframework.stereotype.Component;

import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

/**
 * @author 86188
 * @date 2023/09/05
 */
@Component
public class JavaDockerCodeSandbox extends JavaCodeSandboxTemplate{
    private static final long TIME_OUT =  5000L;

    private static boolean FIRST_INIT = true;


    /**
     * 运行文件
     *
     * @param userCodeFile 用户代码文件
     * @param inputList    输入列表
     * @return {@link List}<{@link ExecuteMessage}>
     */
    @Override
    public List<ExecuteMessage> runFile(File userCodeFile, List<String> inputList) {
        String userCodeParentPath = userCodeFile.getParentFile().getAbsolutePath();
        //创建容器、把文件复制到容器中
        //获取默认的dockerClient
        DockerClient dockerClient = DockerClientBuilder.getInstance().build();
        String img = "openjdk:8-alpine";
        if (FIRST_INIT){
            PullImageCmd pullImageCmd = dockerClient.pullImageCmd(img);
            PullImageResultCallback pullImageResultCallback = new PullImageResultCallback() {
                @Override
                public void onNext(PullResponseItem item) {
                    System.out.println("下载镜像："+ item.getStatus());
                    super.onNext(item);
                }
            };
            try {
                pullImageCmd.exec(pullImageResultCallback).awaitCompletion();
                System.out.println("下载完成");
                FIRST_INIT = false;
            }catch (Exception e){
                System.out.println("程序拉取异常");
                throw new RuntimeException(e);
            }

        }

        //创建容器
        CreateContainerCmd containerCmd = dockerClient.createContainerCmd(img);
        HostConfig hostConfig = new HostConfig();
        //设置linux安全配置
//        hostConfig.withSecurityOpts(Arrays.asList("seccomp = 安全管理配置字符串"));
        //设置内容
        hostConfig.withMemory(100*1000*1000L);
        //设置交换内存
        hostConfig.withMemorySwap(0L);
        //设置cpu数
        hostConfig.withCpuCount(1L);
        //容器挂载映射
        hostConfig.setBinds(new Bind(userCodeParentPath,new Volume("/app")));
        CreateContainerResponse exec = containerCmd
                .withHostConfig(hostConfig)
                .withAttachStderr(true)
                //禁用网络
                .withNetworkDisabled(true)
                //禁止向根目录写文件
                .withReadonlyRootfs(true)
                .withAttachStdin(true)
                .withAttachStdout(true)
                .withTty(true)
                .exec();
        System.out.println(exec);
        String containerId = exec.getId();
        //启动容器
        dockerClient.startContainerCmd(containerId).exec();
        //执行命令获取结果
        ArrayList<ExecuteMessage> executeMessageList = new ArrayList<>();
        for (String inputArgs : inputList) {
            StopWatch stopWatch = new StopWatch();
            String[] inputArgsArray = inputArgs.split(" ");
            String[] cmdArray = ArrayUtil.append(new String[]{"java","-cp","/app","Main"},inputArgsArray);
            ExecCreateCmdResponse execCreateCmdResponse = dockerClient.execCreateCmd(containerId)
                    .withCmd(cmdArray)
                    .withAttachStderr(true)
                    .withAttachStdin(true)
                    .withAttachStdout(true)
                    .exec();
            System.out.println("创建执行命令："+execCreateCmdResponse);
            ExecuteMessage executeMessage = new ExecuteMessage();
            final String[] message = {null};
            final String[] errorMessage = {null};

            long time = 0L;
            final boolean[] timeout = {true};
            ExecStartResultCallback execStartResultCallback = new ExecStartResultCallback(){
                @Override
                public void onComplete() {
                    timeout[0] =false;
                    super.onComplete();
                }

                @Override
                public void onNext(Frame frame) {

                    StreamType streamType = frame.getStreamType();
                    if (StreamType.STDERR.equals(streamType)){
                        errorMessage[0] = new String(frame.getPayload());
                        System.out.println("输出错误："+ errorMessage[0]);
                    }else {
                        message[0] = new String(frame.getPayload());
                        System.out.println("输出结果："+ message[0]);
                    }

                    super.onNext(frame);
                }
            };
            //获取占用内存
            final long[] maxMemory = {0L};
            StatsCmd statsCmd = dockerClient.statsCmd(containerId);
            ResultCallback<Statistics> statisticsResultCallback = statsCmd.exec(new ResultCallback<Statistics>() {
                @Override
                public void onStart(Closeable closeable) {

                }

                @Override
                public void onNext(Statistics statistics) {
                    Long usage = statistics.getMemoryStats().getUsage();
                    System.out.println("内存占用" +usage);
                    maxMemory[0] = Math.max(maxMemory[0],usage);
                }

                @Override
                public void onError(Throwable throwable) {

                }

                @Override
                public void onComplete() {

                }

                @Override
                public void close() throws IOException {

                }
            });
            statsCmd.close();
            try {
                stopWatch.start();
                dockerClient.execStartCmd(execCreateCmdResponse.getId()).exec(execStartResultCallback).awaitCompletion(TIME_OUT, TimeUnit.MICROSECONDS);
                stopWatch.stop();
                time = stopWatch.getLastTaskTimeMillis();
            }catch (Exception e){
                System.out.println("程序执行异常");
                throw new RuntimeException(e);
            }
            executeMessage.setMessage(message[0]);
            executeMessage.setErrorMessage(errorMessage[0]);
            executeMessage.setTime(time);
            executeMessage.setMemory(maxMemory[0]);
            executeMessageList.add(executeMessage);
        }
        return executeMessageList;
    }


}
